Unknown Piece Above the Connector Between Carburetor and Cylinder (YEIS)
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Hi, I'm new here and I'm not sure if I'm posting in the right place, however, I'm a recent owner of a 2005 Yamaha DT 125 X and I'm still trying to figure out the function of certain parts like the one in the photo
I would be grateful if someone cuold help me figure out what it is.
Thank you -
Hi, I'm new here and I'm not sure if I'm posting in the right place, however, I'm a recent owner of a 2005 Yamaha DT 125 X and I'm still trying to figure out the function of certain parts like the one in the photo
I would be grateful if someone cuold help me figure out what it is.
Thank you@ALLE19E04 Hello there and welcome.
That is the Yamaha Energy Induction System (YEIS).
You should also find another one on the carburetor to airbox boot.
On June 30, 1980, Yamaha announced two new energy-saving engine system technologies that it had developed independently: the Yamaha Induction Control System (YICS), a technology for 4-stroke engines, and the Yamaha Energy Induction System (YEIS) for 2-stroke engines.
YICS reduced the amount of fuel consumed by speeding up intake charge to the cylinders, reducing combustion time, and increasing combustion efficiency. This technology made it possible to create energy-efficient, low-cost engines.
the speed of intake charge in the intake manifold to ensure stable intake efficiency, which results in improved output and lower fuel consumption. In testing on actual motorcycles, it was confirmed that fuel was conserved by around 10%. Development focused on 2-stroke engines, but the technology could also be applied to 4-stroke engines. YEIS was first used on the YZ motorcycle in 1980, then on four 2-stroke models in 1981.The Yamaha DT125LC had these:
